it would be nice if municipal law required you to be responsible for your rogue trees...but at least here in Barrie...they don't. We have a rear neighbor who has two giant unruly messy Manitoba Maples that have huge branches that hang over my yard and clog my pool..drop broken branches in my yard on my deck and in my pool. If one of these trees were to loose one of these massive branches it would destroy my deck and pool. I was told I have every right to prune them if I choose to...but the neighbor has no obligation to do so...it would cost me thousands to hire somebody to cut those trees back.